A nut having a sleeve portion on its under side, which can be crimped or clinched to hold the item in place when inserted in a hole.
NSN 5835-01-397-5841
NSN 6240-01-122-0307
NSN 6650-01-159-4251
NSN 5925-01-620-7455
NSN 6320-01-046-5228
NSN 5835-01-647-6426
NSN 5910-01-530-0828
NSN 5945-01-519-4289
NSN 5935-01-097-1073
NSN 6105-01-609-2935
NSN 6650-01-539-9641
NSN 5998-00-894-4866